Interface definition EC-A1684JD4 has rich interfaces, mainly including: 12V Power interface Power button RS232 RS485 1000Mbps Ethernet x 2 USB 3.0 x 2 USB 2.0 x 2 HDMI TF card slot SIM card slot BT antenna WIFI antenna x 2 4G antenna Antenna Connection SIM Card Insertion Serial Port Pinout